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Dammit! I thought I had read that [xxxxquote] gave me one of those pretty text boxes ah well, back to the drawing board.....
Unfortunately the only flow visualisation pictures I have are taken at AoAs where the tip vortex has been swallowed by the main vortex, but I thought I would paste them anyway as most people would never have seen them. In this one you can see the forebody vortices quite clearly (the bluegreen streaks) but since it is a zero sideslip case they don't go anywhere near the fin.
On closer inspection, maybe you can just see the wingtip vortices as separate bits of curly white smoke very close to each wingtip.
I'm not going to risk losing all that typing trying to attach a second picture, so I will send that separately
CliveL